EP1073214B1 - Systeme de communication radio, emetteur et recepteur - Google Patents

Systeme de communication radio, emetteur et recepteur Download PDF

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Publication number
EP1073214B1
EP1073214B1 EP99947875A EP99947875A EP1073214B1 EP 1073214 B1 EP1073214 B1 EP 1073214B1 EP 99947875 A EP99947875 A EP 99947875A EP 99947875 A EP99947875 A EP 99947875A EP 1073214 B1 EP1073214 B1 EP 1073214B1
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EP
European Patent Office
Prior art keywords
signals
antennas
communication system
radio communication
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP99947875A
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German (de)
English (en)
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EP1073214A1 (fr
EP1073214A4 (fr
Inventor
Hiroshi Mitsubishi Denki Kabushiki Kaisha KUBO
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication date
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Publication of EP1073214A1 publication Critical patent/EP1073214A1/fr
Publication of EP1073214A4 publication Critical patent/EP1073214A4/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0678—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using different spreading codes between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding

Definitions

  • the present invention relates to a radio communication system including a mobile phone. More specifically, this invention relates to a radio communication system and transmitter which are capable of covering a wide area with a simple structure under the environment such that a plurality of transmitters transmit same signals with same frequencies.
  • Fig. 11 is a diagram showing a structure of the conventional radio communication system having a structure for covering a wide area.
  • legends 107A and 107B represent base stations
  • legend 101 represents a transmission information input terminal into which transmission information is input from a network.
  • legends 102A and 102B represent modulators
  • legends 103A and 103B represent antennas of the base stations
  • legends 104 represents a mobile station
  • legend 105 represents an antenna of the mobile station.
  • an internal structure of the base stations 107A and 107B will be described concentrating at the modulators 102A and 102B which have the most important function.
  • the base station 107A transmits information via the antenna 103A.
  • the base station 107B transmits information via the antenna 103B.
  • the mobile station 104 receives transmitted signals from the two base stations 107A and 107B via the antenna 105.
  • the radio wave environments in the transmission antennas 103A and 103C are independent of each other, the phenomenon such that the received signals offset each other and no signal exists can be eliminated by a diversity effect. As a result, the characteristic can be improved.
  • the base station is only one, and the transmission signals are delayed by not less than 1 symbol. For this reason, a circuit size of the equalizer in the mobile station is disadvantageously increased, and thus this structure is insufficient to solve the problem.
  • US-A-5423059 discloses a simulcast communication system, wherein a controller determines enhanced coverage area delays for each of different transmitters in order to enhance the transmitted signal quality.
  • the present invention is devised in order to solve the above problems. It is an object of the invention to provide a radio communication system and a transmitter which previously prevent the phenomenon that all signals decay after synthesization in mobile stations between a plurality of base stations and are capable of covering a wide area with a simple structure.
  • a radio communication system is constituted so as to have a plurality of antennas each transmitting same signal and a receiver that receives these signals, and is characterized in that signals which are supplied to the plurality of antennas are signals which are obtained by differently delaying modulated signals and by carrying out weighting synthesization on them, and at least one of delay amount and weighting factor is set to different values in each of the antennas.
  • At least one of the delay amount and weighting factor in the signal filtering sections corresponding to the plural antennas in one transmitter is set to a different value between the adjacent antennas so that the conventionally occurring phenomenon that the filtered signals decays in a specified area is previously prevented. Moreover, even if the transmitters have only one antenna, the same effect as that of the structure having a plurality of antennas can be produced. Further, the delay can be set so as not to be not less than 1 symbol so that the circuit size of the equalizer in the receiver is reduced.
  • the receiver demodulates the filtered signals from the plural antennas using the equalizer.
  • a transmitter is characterized in that in the case where same signals are transmitted from a plurality of antennas, signals which are supplied to respective antennas are signals which are obtained by differently delaying modulated signals and by carrying out weighting synthesization on them, and at least one of delay amount and weighting factor is set to different values in the antennas.
  • At least one of the delay amount and weighting factor in respective signal filtering sections corresponding to the plural antennas of one transmitter is set to a different value between the adjacent antennas so that the conventionally occurring phenomenon that the fil tered signals erupt in a specified area is previously prevented.
  • a transmitter is characterized in that in the case where same signals are transmitted from a plurality of antennas, signals which are supplied to respective antennas are signals which are obtained by delaying original modulated signals, by weighting the delayed signals and by synthesizing the weighted signals with the original modulated signals, and at least one of delay amount and weighting factor is set to different values for each of said antennas.
  • At least one of the delay amount and weighting factor in respective signal filtering sections corresponding to the plural antennas of one transmitter is set to a different value between the adjacent antennas so that the conventionally occurring phenomenon that the filtered signals erupt in a specified area is previously prevented.
  • Fig. 1 is a diagram showing a structure of a radio communication system according to a first embodiment of the present invention
  • Fig. 2 is a timing chart showing radio wave propagation in the radio communication system according to the first embodiment
  • Fig. 3 is a timing chart showing radio wave propagation in the radio communication system which is operated by a condition different from one shown in Fig. 2
  • Fig. 4 is a diagram showing a concrete example in the case where the radio communication system of the present invention is applied to communication between a base station and a mobile station
  • Fig. 5 is a diagram showing a structure of the radio communication system according to a second embodiment
  • Fig. 6 is a diagram showing a structure of signal filtering sections 11A and 11B
  • Fig. 1 shows the structure of the radio communication system according to a first embodiment of the present invention.
  • legend 1 represents a transmission information input terminal
  • legends 2A and 2B represents transmitters
  • legend 3 represents a receiver
  • legends 4A and 4B represent modulators.
  • legends 5A and 5B represent first gain adjuster
  • legends 6A and 6B represent delay units
  • legends 7A and 7B represent second gain adjuster.
  • legends 8A and 8B represent first antennas
  • legends 9A and 9B represent second antennas
  • legend 10 an antenna of the receiver 3.
  • the radio communication system having the above structure is constituted so that at least one antenna (two antennas have been shown in the figure for convenience of explanation) is provided in each of the transmitters 2A and 2B (only two transmitters have been shown in the figure for convenience of explanation).
  • signals to be transmitted from the antennas 9A and 9B are delayed arbitrarily (including a case where no delay is given) by each of the delay units 6A and 6B.
  • the delay outputs from the transmitters are set so that their output powers are different from each other.
  • the transmitters transmit the signals with the set output powers from respective antennas.
  • two transmitters have been shown for the convenience of explanation, but the present invention is not limited to this. That is, three or more transmitters may be provided.
  • two antennas have been shown in each of the transmitters, but the present invention is not limited to this. That is, any number of antennas may be used.
  • the radio communication system having the above structure will be explained here.
  • the signal in the transmitter 2A, after an output level of the signal to be transmitted is regulated by the first gain adjuster 5A, the signal is transmitted from the first antenna 8A without delay.
  • the signal is delayed by the delay unit 6A.
  • the output level of this signal is further regulated by the second gain adjuster 7A so as to be transmitted from the second antenna 9A.
  • the transmitter 2B after an output level of the signal to be transmitted is regulated by the first gain adjuster 5B, the signal is transmitted from the first antenna 8B without delay.
  • the signal is delayed by the delay unit 6B.
  • the output level of this signal is regulated by the second gain adjuster 7B so as to be transmitted from the second antenna 9B.
  • the receiver 3 receives the signals transmitted from the four antennas 8A, 8B, 9A and 9B via the antenna 10 and executes the demodulation process.
  • Fig. 2 is a timing chart showing radio wave propagation of the radio communication system according to the present embodiment.
  • the delay values of the delay units 6A and 6B are equal, further, the gains of the first gain adjuster 5A (transmitter 2A) and the second gain adjuster 7B (transmitter 2B) are equal, and the gains of the second gain adjuster 7A (transmitter 2A) and the first gain adjuster 5B (transmitter 2B) are equal.
  • the gains of the first gain adjuster and the second gain adjuster in the respective transmitters are not same.
  • the distance between the first antenna 8A and the second antenna 9A in the transmitters 2A is negligibly small as compared to the distance between two transmitters.
  • the distance between the first antenna 8B and the second antenna 9B in the transmitter 2B is negligibly small as compared to the distance between the transmitters. Therefore, in this structure, a condition that a signal receiving environment becomes the most strict is the case where the receiver 3 is positioned at almost half way between two transmitters. Further, in the receiver 3, the received signal level becomes the lowest when the delay values of the delay units 6A and 6B are the same as shown in Fig.
  • gains of the first gain adjuster 5A and the first gain adjuster 5B are different from the gains of the second gain adjuster 7A and the second gain adjuster 7B. For this reason, in the above explained cases, even if the received signals with the same delay amount are input with opposite phases, the received signals never offset each other completely and therefore remain. Precisely, in Fig. 2 , two signals of a signal component CA and a signal component CC as filtered signals whose delay amounts are different remain.
  • the radio communication system operates as follows. This condition can be satisfied under the environment that the receiver 3 exists near the transmitter 2A.
  • Fig. 3 is a timing chart showing radio wave propagation in the radio communication system in the above case.
  • Fig. 4 is a diagram showing a concrete example in the case where the transmitters in the communication system shown in Fig. 1 are replaced by base stations (corresponding to base stations 31A and 32B in the diagram), and the receiver is replaced by mobile station (corresponding to mobile station 32), and the radio communication system of the present invention is applied to the communication between the base stations and the mobile station.
  • Two base stations have been shown in Fig. 4 for convenience of the explanation, but the present invention is not limited to this. That is, three or more base stations may be used.
  • two antennas are shown in each of the base stations, but the present invention is not limited to this. That is, any number of antennas may be used.
  • Fig.5 shows a structure of the radio communication system according to a second embodiment. This embodiment is not an embodiment of the invention but helpful to understand certain aspects of the invention. The same legends are provided to the parts of the structure which are the same as those of the first embodiment, and the explanation thereof is omitted.
  • 2C and 2D are transmitters
  • 11A and 11B are signal filtering sections.
  • Fig. 6 is a diagram showing a structure of the signal filtering sections 11A and 11B.
  • legend 21 represents a modulated signal input terminal
  • legend 22 represents a delay unit
  • legend 23 represents a complex weight section
  • legend 24 represents a synthesization circuit
  • legend 25 represents a filtered signal output terminal.
  • the radio communication system having the above structure is constituted so that at least one antenna (only one antenna is shown for convenience of explanation) is provided in a plurality of transmitters (only two transmitters are shown for convenience of explanation) 2C and 2D.
  • Modulated signals which are output from the antennas 12A and 12B, for example, are delayed arbitrarily by the delay units 22 (including the case where the signals are not delayed).
  • Weight synthesization is executed in the synthesization circuit 24 by using the original modulated signals and the arbitrarily delayed modulated signals so that filtered signals are generated. Thereafter, the transmitters output transmission signals from the antennas with set output power.
  • Fig. 5 The structure shown in Fig. 5 is only the one that is required to fulfill all the important functions.
  • this function includes a case where an up-converting process for converting a base band signal into RF frequency has been performed at the time of outputting from the modulators 4A and 4B, a case where the process is performed after the delay process, or a case where the process is performed after gain regulation and all these cases.
  • the antennas include a leakage coaxial cable or the like which has the same function as a normal antenna.
  • the filtered signal is transmitted from the antenna 12A.
  • the signal filtering section 11A executes the weight synthesization on the signal modulated by the modulator 4A so as to generate the filtered signal
  • the filtered signal is transmitted from the antenna 12B.
  • the receiver 3 receives the signals transmitted from the two antennas 12A and 12B via the antenna 10, and executes the demodulation process.
  • Fig. 7 is a timing chart showing the radio wave propagation in the radio communication system according to the present embodiment.
  • the present embodiment will explain the case where after the synthesization sections 11A and 11B delay the normal modulated signals differently (hereinafter, one signal is not delayed), phase rotation and amplitude regulation are carried out in the complex weight section 23, and the weighted signals which undergo the complex weighting are synthesized with the original modulated signals by the synthesization circuit 24.
  • the delay of the delay unit 22 in the signal filtering section 11A is set to 1 symbol
  • a value of phase rotation/amplitude regulation in the complex weight section 23 (hereinafter, referred to as a weighting factor) is set to -1 (180° phase rotation) .
  • the delay of the delay unit 22 in the signal filtering section 11B is set to 1 symbol, and a weighting factor of the complex weight section 23 is set to 1 (without phase rotation) .
  • the setting the delay amount and weight factors in the respective signal filtering sections is not limited to the above setting, and at least one of them may be different between the transmitters.
  • the condition that the signal receiving environment becomes the most strict is the case where the receiver 3 is positioned in between the two transmitters.
  • the phase relationship between these signals can attain any arbitrary value.
  • the phase relationship between these signals is determined constantly by the complex weight section 23.
  • Fig. 8 is a diagram showing a concrete example in the case where the transmitters in the communication system shown in Fig. 5 are replaced by base stations (corresponding to base stations 31C and 32D in the drawing), and the receiver is replaced by a mobile station (corresponding to a mobile station 32), and the radio communication system is applied to the communication between the base stations and the mobile station.
  • Two base stations have been shown in Fig. 8 for convenience of explanation but three or more base stations may be used.
  • one antenna is shown in each of the base stations, but any number of antennas may be used.
  • Fig.9 shows a structure of the radio communication system according to a third embodiment of the present invention.
  • the same legends are provided to parts of the structure which are the same as those in the first and second embodiments, and the explanation thereof is omitted.
  • legend 2E represents a transmitter
  • legend 11C represents a first signal filtering section
  • legend 11D represents a second signal filtering section.
  • the signal filtering sections in the present embodiment are the same as that shown in Fig. 6 according to the second embodiment.
  • Fig. 9 The structure shown in Fig. 9 is only the ideal structure which fulfills all the important functions.
  • this function includes a case where an up-converting process for converting a base band signal into RF frequency has been performed at the time of outputting from the modulators 4A and 4B, a case where the process is performed after the delay process, or a case where the process is performed after gain regulation and all these cases.
  • the antennas include a leakage coaxial cable or the like which has the same function as a normal antenna.
  • a difference between the present embodiment and the second embodiment is that one antenna is provided to each of the two transmitters but the two signal filtering sections are provided to one transmitter so that the total number of the antennas is two. Therefore, in the present embodiment, at least one of the delay amount and weighting factors in the signal filtering sections corresponding to a plurality of antennas provided to one transmitter is set to different values for the adjacent antennas. As a result, the same effect as that of the second embodiment can be produced.
  • the radio communication system of the present invention is useful for radio communication systems including a mobile phone. Particularly, this system is suitable to a radio communication system which should cover a wide area in an environment that reception of a signal is difficult such as a place where signals from a plurality of base stations offset each other.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (3)

  1. Système de communication radio, dans lequel un émetteur (2E) ayant une pluralité d'antennes (12A, 12B) émet les mêmes signaux et un récepteur (3) reçoit ces signaux, caractérisé en ce que les signaux qui sont délivrés à ladite pluralité d'antennes (12A, 12B) sont des signaux que l'on obtient en retardant des signaux modulés d'origine, en pondérant les signaux retardés et en synthétisant les signaux pondérés avec les signaux modulés d'origine, et au moins un élément choisi parmi la quantité de retard et le facteur de pondération est réglé à différentes valeurs pour chacune desdites antennes (12A, 12B).
  2. Système de communication radio selon la revendication 1, caractérisé en ce qu'un égaliseur dudit récepteur (3) démodule les signaux émis par ladite pluralité d'antennes.
  3. Emetteur ayant une pluralité d'antennes (12A, 12B), caractérisé en ce que, dans le cas où les mêmes signaux sont émis par une pluralité d'antennes (12A, 12B), les signaux qui sont délivrés auxdites antennes (12A, 12B) sont des signaux que l'on obtient en retardant les signaux modulés d'origine, en pondérant les signaux retardés et en synthétisant les signaux pondérés avec les signaux modulés d'origine, et au moins un élément choisi parmi la quantité de retard et le facteur de pondération est réglé à différentes valeurs pour chacune desdites antennes.
EP99947875A 1999-02-16 1999-10-13 Systeme de communication radio, emetteur et recepteur Expired - Lifetime EP1073214B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3665599 1999-02-16
JP3665599 1999-02-16
PCT/JP1999/005646 WO2000049730A1 (fr) 1999-02-16 1999-10-13 Systeme de communication radio, emetteur et recepteur

Publications (3)

Publication Number Publication Date
EP1073214A1 EP1073214A1 (fr) 2001-01-31
EP1073214A4 EP1073214A4 (fr) 2005-02-02
EP1073214B1 true EP1073214B1 (fr) 2008-12-17

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US (3) US7346316B1 (fr)
EP (1) EP1073214B1 (fr)
DE (1) DE69940111D1 (fr)
TW (1) TW441203B (fr)
WO (1) WO2000049730A1 (fr)

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WO2000049730A1 (fr) 2000-08-24
US7929922B2 (en) 2011-04-19
US8027649B2 (en) 2011-09-27
EP1073214A1 (fr) 2001-01-31
TW441203B (en) 2001-06-16
DE69940111D1 (de) 2009-01-29
US20080064428A1 (en) 2008-03-13
US7346316B1 (en) 2008-03-18
US20080064335A1 (en) 2008-03-13
EP1073214A4 (fr) 2005-02-02

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